Fixed-Maturity Securities Available-For-Sale (Additional Information) (Details) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2025 USD ($) Number	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) Number
Credit loss expense related to fixed-maturity securities	$ 0		$ 0
Proceeds from maturities, and redemptions of fixed-maturities securities	75,745	$ 25,059
Realized gross gains on sale of fixed-maturities securities	$ 6	$ 8
Number of Securities had Unrealized Losses \| Number	29		125
Restricted Cash and Cash Equivalent	$ 539,855		$ 295,802
VIE Primary Beneficiary [Member]
Restricted Cash and Cash Equivalent	$ 540,634		$ 296,433

Number of Securities had Unrealized Losses

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

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Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of expense related to credit loss from transactions other than loan and lease transactions.

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Amount of cash and cash equivalent restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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